Fix generic record construction for fields with fieldName annotation (#698)

Author: 987Nabil

zio-schema-derivation/shared/src/main/scala-2/zio/schema/DeriveSchema.scala

@@ -330,9 +330,11 @@ object DeriveSchema {
               }
           }
           val fromMap = {
-            val casts = fieldTypes.map { termSymbol =>
-              q"""
-                 try m.apply(${termSymbol.name.toString.trim}).asInstanceOf[${termSymbol.typeSignature}]
+            val casts = fieldTypes.zip(fieldAnnotations).map {
+              case (termSymbol, annotations) =>
+                val newName = getFieldName(annotations).getOrElse(termSymbol.name.toString.trim)
+                q"""
+                 try m.apply(${newName}).asInstanceOf[${termSymbol.typeSignature}]
                  catch {
                    case _: ClassCastException => throw new RuntimeException("Field " + ${termSymbol.name.toString.trim} + " has invalid type")
                    case _: Throwable  => throw new RuntimeException("Field " + ${termSymbol.name.toString.trim} + " is missing")

zio-schema-json/shared/src/main/scala/zio/schema/codec/JsonCodec.scala

@@ -814,7 +814,9 @@ object JsonCodec {
           if (Lexer.firstField(trace, in)) {
             while ({
               val field = Lexer.string(trace, in).toString
-              structure.find(_.name == field) match {
+              structure.find(
+                f => f.name == field || f.annotations.collectFirst { case fieldName(name) => name }.contains(field)
+              ) match {
                 case Some(Schema.Field(label, schema, _, _, _, _)) =>
                   val trace_ = JsonError.ObjectAccess(label) :: trace
                   Lexer.char(trace_, in, ':')

zio-schema-json/shared/src/test/scala-2/zio/schema/codec/JsonCodecSpec.scala

@@ -1906,7 +1906,7 @@ object JsonCodecSpec extends ZIOSpecDefault {
     f20: Option[String] = None,
     f21: Option[String] = None,
     f22: Option[String] = None,
-    f23: Option[String] = None
+    @fieldName("$f23") f23: Option[String] = None
   )
 
   object RecordExample {